Image Item No. Description By  3941pb30  Brick, Round 2 x 2 with Axle Hole with Red Question Mark and Coral Pixels on Yellow Background Pattern (Sticker) - Set 71707 Catalog: Parts: Brick, Round, Decorated 36  3941pb31  Brick, Round 2 x 2 with Axle Hole with White Question Mark and Dark Turquoise Pixels on Black Background Pattern (Sticker) - Set 71713 Catalog: Parts: Brick, Round, Decorated 24